import numpy as np
arr1=np.array([1,2,3])
print('一维数组array:\n', arr1)
arr2=np.array((4.5,5.6,6.8),dtype ='int32')
print('一维数组arr2:\n',arr2)
arr3=np.array([[1,2,3],[4,5,6,]],dtype='float32')
print('2*3的二维数组arr3:\n',arr3)

import numpy as np
arr11=np.array([1.1,2.2,3.3])
print('一维数组arr11:\n', arr11)
arr111=np.array((-1, -2 ,-3),dtype ='int32')
print('一维数组arr111:\n',arr111)
arr1111=np.array([3,'-2', 2.3 ],dtype='float32')
print('一维数组arr1111:\n',arr1111)
